The end of term exam of the third semester is nearing yet nobody has been expelled as of now, making it the first time in history this has happened. Thus an additional special exam "The Class Poll" will be held.

It’s an exam calling for the students to heartlessly choose one of their own classmates to expel. Someone has to go. With this reality thrust before them, C-Class is dissolving, and not even the voice of the calm Hirata is reaching them. In the midst of rising suspicions, a traitor appears marking it the biggest crisis yet. At the same time, A-Class has quickly decided on their choice and voices within D-Class are calling for Ryūen to be expelled. During all this, Ichinose from B-Class is about to make a certain deal with the Student Council President Nagumo in order to save her classmates.